JPS60259752A - Piston for internal-combustion engine - Google Patents
Piston for internal-combustion engineInfo
- Publication number
- JPS60259752A JPS60259752A JP11465984A JP11465984A JPS60259752A JP S60259752 A JPS60259752 A JP S60259752A JP 11465984 A JP11465984 A JP 11465984A JP 11465984 A JP11465984 A JP 11465984A JP S60259752 A JPS60259752 A JP S60259752A
- Authority
- JP
- Japan
- Prior art keywords
- piston
- land
- combustion engine
- diameter cylindrical
- internal combustion
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J9/00—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は、内燃機関のピストンに関するもので、特に
圧力リングと油リングとの２本のピストンリングを有す
るピストンに好適な改良に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a piston for an internal combustion engine, and particularly to improvements suitable for a piston having two piston rings, a pressure ring and an oil ring.
従来、圧力リングと油リングとを各１本づつ設けたピス
トンは広く知られている（例えば、実公昭５２−３７６
８５号公報）が、自動車や自動二輪車など高速内燃機関
に使用されるピストンは、一般に上部に嵌合される２本
の圧力リングと、その下側に嵌合される１本の油リング
との、計３本が用いられている。Hitherto, pistons equipped with one pressure ring and one oil ring have been widely known (for example, in Japanese Utility Model Publication No. 52-376).
Publication No. 85), pistons used in high-speed internal combustion engines such as automobiles and motorcycles generally have two pressure rings fitted on the top and one oil ring fitted on the bottom. , a total of three are used.
近年、上記高速エンジンにおいても、エンジンの摩擦損
失を減じ、最高出力を向上させるべく、圧力リングを１
本にすることが行われている。然しなから、ブローバイ
ガスの増加や、ピストンの過熱などの不具合を生じるこ
とがあり、特に過給エンジンのように混合気の燃焼温度
が高いエンジンにこの傾向が太きい。In recent years, even in the above-mentioned high-speed engines, one pressure ring has been added in order to reduce engine friction loss and improve maximum output.
A book is being written. However, problems such as an increase in blow-by gas and overheating of the piston may occur, and this tendency is particularly strong in engines where the combustion temperature of the air-fuel mixture is high, such as a supercharged engine.
この発明のピストンは、上記不具合を解決すべくなされ
たものであり、少なくとも上下に配置された２個のピス
トンリング溝の間に形成されるランドのピストン頂面側
を比較的大径の円筒部となし、その下側を小径の逃げ部
に形成した点に％徴がある。The piston of the present invention has been made in order to solve the above-mentioned problems, and the piston top surface side of the land formed between at least two piston ring grooves arranged above and below is connected to a relatively large diameter cylindrical part. The % mark lies in the fact that the lower side is formed into a small diameter relief part.
斯くて、エンジンの爆発行程において生じた高温高圧の
燃焼ガスは、シリンダの内壁とピストンのトップランド
との隙間を通して、上側のピストンリングすなわち、圧
力リングに至り、更に一部はそこから洩れて、下側のリ
ング、すなわち油１ノングに至る。Thus, the high-temperature, high-pressure combustion gas generated during the engine's explosion stroke reaches the upper piston ring, that is, the pressure ring, through the gap between the inner wall of the cylinder and the top land of the piston, and some of it leaks from there. Reach the lower ring, i.e. oil 1 nong.
この発明のピストンは上下に配置された２個のピストン
リング溝の間に形成されるランドが頂面側を比較的大径
の円筒部となし、その下側を小径の逃げ部とされている
から、圧力リングを吹き抜けた燃焼ガスは大径部によっ
て阻止され、ブローバイガスの発生が減少する。また、
大径部はシリンダの内壁に接触しやすくなり、ピストン
の熱はここを通してシリンダに放熱されるので、ピスト
ンの過熱が防止できる。In the piston of this invention, the land formed between two piston ring grooves arranged above and below has a relatively large diameter cylindrical portion on the top surface side, and a small diameter relief portion on the lower side. Therefore, the combustion gas that has blown through the pressure ring is blocked by the large diameter portion, reducing the generation of blow-by gas. Also,
The large diameter portion comes into easy contact with the inner wall of the cylinder, and the heat of the piston is radiated to the cylinder through this portion, thereby preventing the piston from overheating.
以下、図示の実施例によって、この発明を説明する。第
３図において、１はガソリン機関に用いられる軽合金製
のピストンであり、燃焼圧力を受けるピストン頂面１ａ
とシリンダの内壁（図示してない）に沿って案内される
円筒形の側壁１ｂとからなる。側壁１ｂの上部には、圧
力χリング溝２と、油リング溝３とが形成され、圧力リ
ング溝２の上側にはトップランド４が、また圧力リング
溝２と、油リング溝３との間には、第２ランド５がそれ
ぞれ設けられている。１ｃはピストンスカート、６はピ
ストンピン孔である。The present invention will be explained below with reference to illustrated embodiments. In Fig. 3, 1 is a light alloy piston used in a gasoline engine, and the top surface 1a of the piston receives combustion pressure.
and a cylindrical side wall 1b guided along the inner wall (not shown) of the cylinder. A pressure ring groove 2 and an oil ring groove 3 are formed in the upper part of the side wall 1b, a top land 4 is formed above the pressure ring groove 2, and a top land 4 is formed between the pressure ring groove 2 and the oil ring groove 3. A second land 5 is provided respectively. 1c is a piston skirt, and 6 is a piston pin hole.
第２ランド５は、第１図で示すように、上側すなわちピ
ストン頂面側を比較的大径の円筒部５ａとなし、すなわ
ち第２ランド５の上側はトップランド４と略同径の円筒
部５ａとされ、その下側はそれ３−
よりや＼小径の円筒状の逃げ部５ｂとされて、それらの
間は段付きとなっている。こ＼で、円筒部亀の幅は小径
の逃げ部５ｂの幅に比べ狭く形成されている。As shown in FIG. 1, the second land 5 has a cylindrical portion 5a having a relatively large diameter on the upper side, that is, on the top side of the piston. 5a, and the lower side thereof is a cylindrical relief part 5b having a smaller diameter than that 3-, and the space between them is stepped. Here, the width of the cylindrical part turtle is formed narrower than the width of the small diameter relief part 5b.
第２ランド５は、この実施例に限らず、第２図で示すよ
うに、上側に形成された前記円筒部５ａに続く小径の逃
げ部をスカート側へ向かって細くなるテーパ５ｃ状とす
ることもできる。The second land 5 is not limited to this embodiment, and as shown in FIG. 2, a small-diameter relief portion continuing from the cylindrical portion 5a formed on the upper side may be formed into a tapered shape 5c that becomes narrower toward the skirt side. You can also do it.
なお、この発明を適用したピストンは、ガソリンエンジ
ンだけでなく、ジーゼルエンジンにも適用可能である。Note that the piston to which this invention is applied is applicable not only to gasoline engines but also to diesel engines.
この発明によれば、ピストン頂面に作用する燃焼ガスは
第２ランド５により阻止されて、その一部のみがブロー
バイガスとなるので、その発生量が減少する。また、ピ
ストンとシリンダ内壁とが接触し易くなり、放熱が良好
になるため、ピストンリングの数を減少させたことに起
因するピストンの過熱を防止することができる等の効果
がある。According to this invention, the combustion gas acting on the top surface of the piston is blocked by the second land 5, and only a part of it becomes blow-by gas, so that the amount of combustion gas generated is reduced. Further, the piston and the cylinder inner wall are more likely to come into contact with each other, and heat radiation is improved, so that it is possible to prevent overheating of the piston caused by reducing the number of piston rings.
４−
図面はこの発明の一実施例を示すものであり、第１図は
ピストンの断面を示す第３図中のＡ部詳細を示す断面図
、第２図はその変形例を示す第１図相当の断面図、第３
図はピストンの断面図である。
１・拳・・ピストンｓ １ａ１１ ＠・・頂面、１ｂ・
・自嘲側壁、２・・・曝圧力リング溝、３１１＠６１１
油リング溝、４・・・・トップランド、５拳・・拳第２
ランド、５ａ・・・・円筒部、５ｂ−Φ・・逃げ部、５
ｃ・・・ｅテーパ部。
特許出願人 ヤマハ発動機株式会社4- The drawings show one embodiment of the present invention, and FIG. 1 is a cross-sectional view showing details of section A in FIG. 3 showing the cross section of the piston, and FIG. 2 is FIG. 1 showing a modification thereof. Corresponding cross-sectional view, 3rd
The figure is a sectional view of the piston. 1.Fist...Piston s 1a11 @...Top surface, 1b.
・Self-mocking side wall, 2... Pressure ring groove, 311@611
Oil ring groove, 4...top land, 5 fist...second fist
Land, 5a... Cylindrical part, 5b-Φ... Relief part, 5
c...e taper part. Patent applicant Yamaha Motor Co., Ltd.
Claims (5)
グ溝の間に形成されるランドのピストン頂面側を比較的
大径の円筒部となし、その下側を小径の逃げ部に形成し
てなる内燃機関のピストン。(1) The piston top surface side of the land formed between at least two piston ring grooves arranged above and below is formed as a relatively large diameter cylindrical part, and the lower side thereof is formed as a small diameter relief part. The piston of an internal combustion engine.
形成されている特許請求の範囲第１項記載の内燃機関の
ピストン。(2) The piston for an internal combustion engine according to claim 1, wherein the land has a tapered relief portion that follows the large-diameter cylindrical portion.
状に形成されている特許請求の範囲第１項記載の内燃機
関のピストン。(3) A piston for an internal combustion engine according to claim 1, wherein the land has a relief portion that follows a large diameter cylindrical portion and is formed in a small diameter cylindrical shape.
に比し、狭く形成されている特許請求の範囲第１項記載
の内燃機関のピストン。(4) The piston for an internal combustion engine according to claim 1, wherein the width of the large-diameter cylindrical portion of the land is narrower than the width of the small-diameter cylindrical portion.
形成されている特許請求の範囲第１項記載の内燃機関の
ピストン。(5) The piston for an internal combustion engine according to claim 1, wherein the large diameter cylindrical portion of the land is formed to have approximately the same diameter as the top land.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11465984A JPS60259752A (en) | 1984-06-06 | 1984-06-06 | Piston for internal-combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11465984A JPS60259752A (en) | 1984-06-06 | 1984-06-06 | Piston for internal-combustion engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS60259752A true JPS60259752A (en) | 1985-12-21 |
Family
ID=14643344
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11465984A Pending JPS60259752A (en) | 1984-06-06 | 1984-06-06 | Piston for internal-combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60259752A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2055426A3 (en) * | 2007-10-30 | 2011-09-14 | KS Kolbenschmidt GmbH | Function optimized configuration of a pistons piston-ring area |
| JP2013164022A (en) * | 2012-02-10 | 2013-08-22 | Kubota Corp | Engine |
| DE102020213242A1 (en) | 2020-10-20 | 2022-04-21 | Mahle International Gmbh | Pistons for an internal combustion engine and manufacturing method |
-
1984
- 1984-06-06 JP JP11465984A patent/JPS60259752A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2055426A3 (en) * | 2007-10-30 | 2011-09-14 | KS Kolbenschmidt GmbH | Function optimized configuration of a pistons piston-ring area |
| JP2013164022A (en) * | 2012-02-10 | 2013-08-22 | Kubota Corp | Engine |
| DE102020213242A1 (en) | 2020-10-20 | 2022-04-21 | Mahle International Gmbh | Pistons for an internal combustion engine and manufacturing method |
| US11680540B2 (en) | 2020-10-20 | 2023-06-20 | Mahle International Gmbh | Piston for an internal combustion engine and production method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4421081A (en) | Spark-ignition internal combustion engine | |
| CA1322136C (en) | Two-cycle engine with offset piston ovality | |
| US3923015A (en) | Combustion chamber of spark ignition internal combustion engine | |
| US5771872A (en) | Combustion chamber of an internal combustion engine | |
| US4216748A (en) | Internal combustion engine with subsidiary combustion chamber | |
| US4191136A (en) | Combustion chamber of an internal combustion engine | |
| JPS60259752A (en) | Piston for internal-combustion engine | |
| JPS5838610B2 (en) | internal combustion engine | |
| JP6389865B2 (en) | Piston for internal combustion engine | |
| JP2001221098A (en) | Sleeve structure of cylinder block | |
| JPH0364654A (en) | Piston for internal combustion chamber | |
| US5906182A (en) | Engine piston | |
| JPS6232349B2 (en) | ||
| US6682078B2 (en) | Ring groove for oil ring with coil expander of piston | |
| JP2001059422A (en) | Structure of spark ignition type four-valve type internal combustion engine | |
| JPS621401Y2 (en) | ||
| JPS62129516A (en) | Combustion chamber for spark ignition type engine | |
| JPH0723538Y2 (en) | Reciprocating internal combustion engine | |
| JP4216944B2 (en) | Combustion chamber structure of internal combustion engine | |
| WO2021156886A1 (en) | A power unit and a reciprocating member thereof | |
| EP0569289A1 (en) | Internal combustion engine with improved anti-knocking function | |
| JPS63230948A (en) | Internal combustion engine | |
| JPH06137428A (en) | Pressure ring for internal combustion engine | |
| JPH0942047A (en) | Cylinder liner | |
| JPS5933881Y2 (en) | Piston for internal combustion engine |